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Endion was a research retreat for protoss scholars for thousands of years, where they could seclude themselves from political affairs. Civilization-changing inventions were created there, such as the psionic matrix.

After the Purifier Rebellion, Endion was chosen as the world where Cybros would be kept in stasis, and secured by a megalith. Khalai scientists would continue improving the stasis grid, and the station would serve as a both a symbol of scientific achievement and a reminder of the dangers of it.[3]

During the End War, the Amon Brood descended on Endion and overran its population and the contingent of Templar assigned to defend it, infesting the planet. However they could not break through the stasis grid that kept Cybros in orbit. HierarchArtanis arrived with the intention of recruiting the ancient purifiers, and fought through the zerg forces on the surface to guide the Megalith to the stasis locks that held the station. The operation was successful, and Cybros was freed.[1]

After a battle to purge the zerg and hybrid from Cybros, ExecutorClolarion fired a purification beam from his station, purifying all life on Endion. All zerg presence on the surface was annihilated.[2]